Transparent OLED front light guide light source

Abstract

The invention belongs to the technical field of light sources, and particularly relates to a transparent OLED (Organic Light Emitting Diode) front light guide light source. Comprising a reflective liquid crystal screen, an ITO substrate, a coating conducting layer, a first hole layer, a second hole layer, an organic light-emitting layer, a first electron injection layer, a second electron injection layer, a cathode layer, a cover plate and a protection screen which are attached in sequence. The cathode layer is a coated silver layer, and the thickness of the cathode layer is less than 200 angstroms. The transparent OLED front light guide light source provided by the invention has the effects of improving the light utilization rate and improving the overall light emitting performance.

Description

Technical Field

[0001] The present invention belongs to the technical field of light sources, and particularly relates to a transparent OLED front light guide light source. Background Art

[0002] OLED (Organic Light-Emitting Diode), namely organic light-emitting diode, is a new product in mobile phone OLEDs and is reputed as a "dream display".

[0003] The OLED display technology is different from the traditional LCD display method. It does not require a backlight and uses a very thin organic material coating and a glass substrate (or a flexible organic substrate). When an electric current passes through, these organic materials will emit light. Moreover, the OLED display screen can be made lighter and thinner, with a larger viewing angle, and can significantly save power consumption.

[0004] An e-book generally refers to a handheld reader. The characteristics of being portable, easy to use, and having a large capacity are very suitable for modern life. The development of digital rights trade and Internet technology enables e-book users to conveniently purchase more books at a lower price. E-books are more favored by users, and users put forward higher requirements for the appearance and quality of e-books. The existing front light guide structure of e-books uses the architecture of full lamination of a front glass light guide plate + a TFT panel, which can effectively improve the stability and service life of the architecture. At the same time, the side fixing frame can also be omitted, making the product appearance more beautiful.

[0005] OCA optical adhesive has high light transmittance and transparency, excellent flatness and anti-aging characteristics, and is the most commonly used solid optical adhesive in full-laminated backlight displays. Generally, the refractive index of OCA is about 1.45, and the light transmittance is above 90%. The low refractive index and high-transmittance OCA optical adhesive has a refractive index of about 1.38, and the light transmittance can reach above 94%. The use of high-transmittance OCA for the lamination of glass light guide plate products will not affect the light output effect of the glass light guide plate.

[0006] The light emission principle of an organic electroluminescent device is based on the fact that under the action of an external electric field, electrons are injected from the cathode into the lowest unoccupied molecular orbital (LUMO) of the organic matter, and holes are injected from the anode into the highest occupied orbital (HOMO) of the organic matter. Electrons and holes meet, recombine, and form excitons in the light-emitting layer. The excitons migrate under the action of the electric field, transfer the energy to the light-emitting material, and excite the electrons to transition from the ground state to the excited state. The energy of the excited state is deactivated by radiation, generating photons and releasing light energy.

[0007] In traditional light-emitting devices, only about 18% of the light inside the device can be emitted to the outside, and the other part will be consumed in other forms outside the device. There is a difference in refractive index between the interfaces, causing the loss of total internal reflection, resulting in a relatively low overall light output performance. Summary of the Invention

[0008] The object of the present invention is to provide a transparent OLED front light guide light source to solve the technical problem of total reflection loss, which leads to low overall light output performance, and achieve the purpose of improving the light utilization rate and enhancing the overall light output performance.

[0009] To solve the above technical problems, the present invention provides a transparent OLED front light guide light source, including, in sequence of lamination:

[0010] A reflective liquid crystal display screen, an ITO substrate, a coated conductive layer, a first hole layer, a second hole layer, an organic light-emitting layer, a first electron injection layer, a second electron injection layer, a cathode layer, a cover plate and a protection screen;

[0011] Further, the cathode layer is a silver-coated layer with a thickness less than 200 angstroms.

[0012] Further, a first OCA adhesive layer is provided between the reflective liquid crystal display screen and the ITO substrate.

[0013] Further, a second OCA adhesive layer is provided between the cover plate and the protection screen.

[0014] The beneficial effects of the present invention are as follows:

[0015] 1. Through the internal reflective liquid crystal display screen, the light reflected from the inside can improve the light utilization rate, and the light reflected from the inside is softer and does not hurt the eyes, improving the light output performance.

[0016] 2. Through the layer structure of the first hole layer, the second hole layer, the organic light-emitting layer, the first electron injection layer and the second electron injection layer, the light can pass through multiple layers, making the light softer.

[0017] 3. Through the first hole layer, the second hole layer, the organic light-emitting layer, the first electron injection layer and the second electron injection layer, it has both hole transport performance and hole injection performance, reducing the processing difficulty of the device and simplifying the process. This structure can greatly improve the light output efficiency of the organic electroluminescent device.

[0018] To make the above objects, features and advantages of the present invention more obvious and understandable, the following specifically enumerates preferred embodiments and, in conjunction with the accompanying drawings, is described in detail as follows. Brief Description of the Drawings

[0019] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] Figure 1 It is a schematic structural diagram of the transparent OLED front light source of the present invention.

[0021] In the figure:

[0022] 1. Reflective liquid crystal screen; 11. First OCA adhesive layer;

[0023] 2. ITO substrate;

[0024] 3. Coated conductive layer;

[0025] 4. First hole layer;

[0026] 5. Second hole layer;

[0027] 6. Organic light-emitting layer;

[0028] 7. First electron injection layer;

[0029] 8. Second electron injection layer;

[0030] 9. Cathode layer;

[0031] 10. Cover plate; 101. Second OCA adhesive layer;

[0032] 11. Protection screen. Specific Embodiments

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions of the present invention with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0034] Embodiment:

[0035] As Figure 1As shown in the figure, a transparent OLED front light source includes, in sequential lamination: a reflective liquid crystal screen 1, an ITO substrate 2, a coated conductive layer 3, a first hole layer 4, a second hole layer 5, an organic light-emitting layer 6, a first electron injection layer 7, a second electron injection layer 8, a cathode layer 9, a cover plate 10, and a protection screen 11; the cathode layer 9 is a silver-coated layer with a thickness less than 200 angstroms. A first OCA adhesive layer 11 is provided between the reflective liquid crystal screen 1 and the ITO substrate 2. A second OCA adhesive layer 101 is provided between the cover plate 10 and the protection screen 11.

[0036] In summary: Through the internal reflective liquid crystal screen 1, the light reflected from the inside can improve the utilization rate of light, and the light reflected from the inside is softer and does not hurt the eyes, improving the light output performance. Through the layer structure of the first hole layer 4, the second hole layer 5, the organic light-emitting layer 6, the first electron injection layer 7, and the second electron injection layer 8, the light can pass through multiple layers, making the light softer. Through the first hole layer 4, the second hole layer 5, the organic light-emitting layer 6, the first electron injection layer 7, and the second electron injection layer 8, it has both hole transport performance and hole injection performance, reducing the processing difficulty of the device and simplifying the process. This structure can greatly improve the light output efficiency of the organic electroluminescent device.

[0037] All the devices selected in this application are common standard parts or components known to those skilled in the art, and their structures and principles can be known to those skilled in the art through technical manuals or obtained through conventional experimental methods.

[0038] In the description of the embodiments of the present invention, unless otherwise clearly defined and limited, the terms "installed", "connected", and "connected" shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0039] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0040] Taking the ideal embodiments of the present invention described above as an inspiration, through the above description, relevant staff can completely make various changes and modifications without departing from the technical idea of this invention. The technical scope of this invention is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A transparent OLED front light source, characterized in that: Including the following: Reflective liquid crystal screen (1), ITO substrate (2), coated conductive layer (3), first hole layer (4), second hole layer (5), organic light emitting layer (6), first electron injection layer (7), second electron injection layer (8), cathode layer (9), cover plate (10) and protective screen (11); 2. A transparent OLED front light source as claimed in claim 1, characterized in that: The cathode layer (9) is configured as a silver-plated layer with a thickness of less than 200 angstroms.

3. A transparent OLED front light source as claimed in claim 2, characterized in that: A first OCA adhesive layer (11) is provided between the reflective liquid crystal screen (1) and the ITO substrate (2).

4. A transparent OLED front light source as claimed in claim 3, characterized in that: A second OCA adhesive layer (101) is provided between the cover plate (10) and the protection screen (11).

Images